The present work compares the suspended sediment yields in the two catchments Saf Saf (322 km) and Kebir West (1,130 km). The suspended sediment transport of sampled storms were calculated using additional concentrations from a regression of the storm in question.
For storms with no or few water samples, a sediment rating curve was used, developed with the discharge class method. The mean annual sediment yield during flood events of the 22 years of the study period was 461 T km in the Saf Saf drainage basin and 247 T km
in the Kebir West basin. Although the Saf Saf drainage basin had lower rainfall and runoff, the erosion was higher. The high sediment yield in the Saf Saf basin could be explained by a high percentage of agricultural land, and cultivation developed on shallow marly silty-clayey soils with
steep slopes often exceeding 23%, while in the Kebir West catchment there is a smaller percentage of cultivated areas which are found on less steep slopes with deeper soils. The negative impacts of this enhanced sediment mobility are directly felt in the Zardézas reservoir which collects
the flows of the Saf Saf catchment. In storms of high magnitude during the winter and spring seasons, wadi Saf Saf had greatly peaked graphs of water discharge and sediment concentration which implies surface runoff with high erosion because cultivated areas are often furrowed downslope during
the winter season, while wadi Kebir West had broad graphs of discharge and comparatively low concentrations.

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